Backward compatible hidden check (bugfix)

[Hook25]

Description

This change was not supposed to be backward incompatible. This fixes it, default is False as before the hidden_manifests change, no manifest was hidden

Resolved issues

Fixes: CHECKBOX-1735
Fixes: #1716

Documentation

N/A

Tests

I installed checkbox stable, that doesnt have this feature, and connected running the provided test plan. It didn't crash as in the bug report

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.12%. Comparing base (9a81f3b) to head (b6e3cd0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1718   +/-   ##
=======================================
  Coverage   49.12%   49.12%           
=======================================
  Files         372      372           
  Lines       40338    40338           
  Branches     6809     6809           
=======================================
  Hits        19816    19816           
  Misses      19799    19799           
  Partials      723      723           

Flag	Coverage Δ
checkbox-ng	69.70% <ø> (ø)

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[pieqq]

+1, thanks for this quick patch!